It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
Culture shock is a feeling________most travellers experience in a foreign country________they find the culture is quite different from that of their own.
The question has been raised at the meeting________each member country should equally share the expense of the committee.
I shall never forget the days ______ we spent together with my grandfather in that old house.
____ is up to us to give them all the help _____ we can.
She is shy. She is not used to_____ in front of others.